1. A vaunter and a liar are near akin. 
2. A boaster and a liar are all one.
3. A liar is worse than a thief.
4. A boaster and a liar are cousins-german.sentencedict.com
5. A great talker is a great liar.
6. Show me a liar, and I'll show you a thief.
7. A liar is not believed when he speaks the truth.
8. Show me a liar, and I will show you a thief.
9. She's an accomplished liar?they believed every word she said.
10. I couldn't persuade him that she was a liar.
11. Don't call me a liar.
12. The man is a crook and a liar.
13. He labeled the boastful man a liar.
14. She refused to tolerate being called a liar.
15. He was a liar and a cheat.
16. He had the temerity to call me a liar!
17. Whoever says that is a liar.
18. Everyone says you're a liar.
19. She was wrongly labelled a liar.
20. He's a consummate athlete/gentleman/liar.
21. He's a filthy liar.
22. You're a filthy liar.
23. I know him for a liar.
24. The press branded him a liar.
25. I know you for a thief and a liar!
26. They called him a good liar.
27. He's nothing but a liar and a fraud.
28. He's a congenital liar .
29. Are you calling me a liar?
30. He is a manifest liar.